The reason for including a placebo group in a drug study is to ...

[Metfan725]

The reason for including a placebo group in a drug study is to control for:
 
  a. experimenter bias.
  b. physiological effects of the drug.
  c. participants' expectations of change.
  d. the experimenter being blind.

Question 2

To control for the Hawthorne effect, you need:
 
  a. more than one observer.
  b. a control group that is not given special attention.
  c. a control group that is given special treatment but does not get the experimental treatment.
  d. a placebo group.

[stanleka1]

Answer to Question 1

C

Answer to Question 2

C

[Metfan725]

Wow, this really help

[raenoj]

Thanks for the timely response, appreciate it